Expansion-valve.



No. 815,912. 11111311131) M1111. 20, 1906. A. H. EDDY. EXPANSION VALVE.

APPLICATION FILED JULY 19. 1905.

' specification.

plunger 5, W

amount of fluid at UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented March 20, 1906.

Application filed July 19, 1905. Serial No. 270,349.

To all whom it may concern:

Be it known that I, ARTHUR H. EDDY, a I

citizen of the United States, residing at Windsor, in the county of Hartford and State of Connecticut, have invented a new and useful Expansion-Valve, of which the following is a This valve is particularly designedjto be used in a refrigerating system for controlling the flow according to the pressure of such a penetrating fluid as ammonia.

The object of the invention is to provide a comparatively simple easily-constructed valve for this purpose which will surely operate and not easily become clo ged'or rendered inoperative by any soli substance which may possibly pass in with the fluid and which will be tight at all times and may be readily adjusted, so that it will operate as desired.

Figure 1 of the accompanying drawlngs shows a central longitudinal section of a valve which embodies the invention. Fig. 2 shows a transverse section on the plane 2 2 looking in the direction indicated by the ar-- rows on Fig; 1. .Fig. 3 shows a side view of the valve-plunger, and Fig. 4 shows a section of the plunger.

The body 1 of the valve is cast to shape with an end 2 for the attachment of the inletpipe and an end 3 for the attachment of the outlet-pipe.

In a reduced portion of the body is a lining 4, and fittin rather tightly in this lining is a ch has a groove 6 near one end and passa es 7 from this groove to the other end, whichpermit the leakage of a small the proper time from one end of the plunger to the other. At one end the plun er is attached to a dlaphragm 8, that is held in the body by a cap 9. The cap in the form shown is screwed into the body against a'packing 10 to insure a tight joint. Located in a hub 11, that extends from the cap, is a spiral spring 12, which tends to thrust the diaphra In and plunger inwardly. The outer end'of t 's spring rests againsta stud 13, which is screwed into the end of the cap and may be turned for adjusting the degree of tension of the spring, a nut 14 and a packing 15 being provided for locking the screw-stud and keeping the joint tight. Aflat valve 16, that is adapted to close against and open from a seat 17, which it driven into an opening in thebody, is fastened to a stem 18, that projects from one end of the plunger. A

- end of the body,

tight joints at the screw 24, held by this cap, is arranged to be packing and the lining in at this end. A thimble 20 is driven into the body outside of the valve-seat. Adiaphragm 21, that is held in the body between the thimble and the plug 22, that is screwed into the ger-stem. A packing 23 is arranged to insure inn r end of this plug. A

turned for deter g the amount of outward movement of the small diaphragm that is connected with the When the'pressure of the expanded fluid in the system on the expansion side of the valves drops so low that the pressure on the large dia hragm is less than the tension of the spring, t e spring thrusts the plunger inwardly and opens the valve. As the valve is opened from its seat liquid from the com- 'pression side of the valve flows through the inlet past the valve and leaks around the plunger into the groove and through the passages in the plunger to the chamber containing the large diaphragm, and from this chamher it flows to .the outlet. After su'flicieht fluid has passed through the valve and the pressure on the expansion side rises sulficiently to cause the diaphragm to force back the spring the plunger is drawn outwardly andthe valve closed against its seat and stops the flow of fluid. he small diaphragm is designed to efiect a counterbalance to the pressure against the valve and end of the plunger, so that these parts will move freely when the predetermined pressures result. The invention claimed is 1. An expansion-valve having a bodywith an inlet, an outlet and a valve-seat between the inlet and outlet, a plunger located on the outlet side of the valve-seat, a valve located on the inlet side of the valve-seat and connected with the plunger, a diaphragm onthe outlet side of the valve-seat and connected with the plunger, and a diaphragm on the inlet side 0 the valve-seat and connected with the plunger, substantially as specified.

expansion-valve having a body with an inlet, an outlet and a valve-seat between the inlet and outlet, a plunger located on the outlet side of the valve-seat between the seat and the outlet, a valve located on the inlet side of the valve-seat and connected with the plunger, and a diaphragm on the outlet side of the valve-seat and connected with the plunger, substantially as specified.

19 is placed betweenthis valve-seat order to insure a tight joint is also fastened to the plun-v stem of the plunger.

' with the Valve, a large diaphragm on the outlet side of the seat and connected with the 1b plunger, a cap holdin the large diaphragm in place, and a plug olding t e small diaphragm in place, substantial y as specified.

ARTHUR H. EDDY.

Witnesses:

ETHEL M. LOWE, HARRY R. WILLIAMS. 

